Ablation study of the superior colliculus in the tree shrew (Tupaia glis)

1974 ◽  
Vol 156 (2) ◽  
pp. 207-237 ◽  
Author(s):  
V. A. Casagrande ◽  
I. T. Diamond
Keyword(s):  
Superior Colliculus ◽  
Tree Shrew ◽  
Tupaia Glis ◽  
Ablation Study

SEM Study on the Dorsal Lingual Surface of the Common Tree Shrew, Tupaia glis

1992 ◽  
Vol 143 (3) ◽  
pp. 253-257 ◽  
Author(s):  
P. Chunhabundit ◽  
S. Thongpila ◽  
R. Somana
Keyword(s):  
Tree Shrew ◽  
Lingual Surface ◽  
Sem Study ◽  
Tupaia Glis ◽  
The Common ◽  
Common Tree

Local Excitatory Circuits in the Intermediate Gray Layer of the Superior Colliculus

1999 ◽  
Vol 81 (3) ◽  
pp. 1424-1427 ◽  
Author(s):  
Diana L. Pettit ◽  
Matthew C. Helms ◽  
Psyche Lee ◽  
George J. Augustine ◽  
William C. Hall
Keyword(s):  
Superior Colliculus ◽  
Intermediate Layer ◽  
Tree Shrew ◽  
Patch Clamp Recording ◽  
Inward Current ◽  
Whole Cell Patch Clamp ◽  
Synaptic Interactions ◽  
Layer Neuron ◽  
Inward Currents ◽  
Synaptic Responses

Local excitatory circuits in the intermediate gray layer of the superior colliculus. We have used photostimulation and whole cell patch-clamp recording techniques to examine local synaptic interactions in slices from the superior colliculus of the tree shrew. Uncaging glutamate 10–75 μm from the somata of neurons in the intermediate gray layer elicited a long-lasting inward current, due to direct activation of glutamate receptors on these neurons, and brief inward currents caused by activation of presynaptic neurons. The synaptic responses occurred as individual currents or as clusters that lasted up to several hundred milliseconds. Excitatory synaptic responses, which reversed at membrane potentials near 0 mV, could be evoked by uncaging glutamate anywhere within 75 μm of an intermediate layer neuron. Our results indicate the presence of extensive local excitatory circuits in the intermediate layer of the superior colliculus and support the hypothesis that such intrinsic circuitry contributes to the development of presaccadic command bursts.

Sign in / Sign up

Export Citation Format

Share Document